Engadget: Logitech Z506 review

Engadget: Audiophiles are quick to name the umpteen flavors of Dolby, but at the risk of oversimplifying things a tad, there are just three types of surround sound today -- each easily identified by their plug. Virtual surround uses just simple stereo jacks, emulating multiple channels from two, while digital surround travels across optical or coaxial S/PDIF cables (or HDMI) and has to be decoded.

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